It’s in the “Align” tool set (Window Menu-Active Tool Pallets-Align-Align Centers. I’m using 5A865 too.) I’m just dragging the line to snap to the point at the Volume Centroid. It says “Point” when it snaps to the centroid. I don’t have “Project”-Osnap on, but still I only get a 2D snap in the Front View. It doesn’t snap to the CPlane, but just remains at it’s current Z value, and aligns with the Volume Centroid point in the background. But it’s OK, because I get the 3D snap in Perspective Window, and that’s a piece of cake.
Buzz